Tonduff (Irish: Tóin Dubh, meaning 'black bottom')[2] at 642 metres (2,106 ft), is the 169th–highest peak in Ireland on the Arderin scale,[3] and the 202nd–highest peak on the Vandeleur-Lynam scale.

The main flat summit is sometimes listed as Tonduff North, while the subsidiary summit, Tonduff East Top 593 metres (1,946 ft), is sometimes listed as Tonduff South.

[2][6] Tonduff East Top has a prominence of only 15 metres (49 ft), which just qualifies it as an Arderin Beg.

[7] A bog on the western slopes of Tonduff, the Liffey Head Bog, forms the source of the River Liffey; bogs on the southern slopes of Tonduff, forms the source of the River Dargle.

This article related to the geography of County Wicklow, Ireland is a stub.